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What should come in place of the 'A' ? 7, 33, 137, 553, A, 8873

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What should come in place of the 'A' ?

7, 33, 137, 553, A, 8873


1. 2127
2. 1217
3. 2117
4. 2217
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Correct Answer - Option 4 : 2217

Calculation:

The series follows following pattern

7 × 4 + 5 = 33

33 × 4 + 5 = 137

137 × 4 + 5 = 553

553 × 4 + 5 = 2217

2217 × 4 + 5 = 8873

∴ The value of ? is 2217

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